Windows Phone 8.0 / 8.1...?

Hi all

I have created an app based on the template Blank App (Xamarin.Forms Shared).

Then a platform-project was created: appname.WinPhone (Windows Phone 8.0)

If I right-click the properties to that project, there is an option "Assign Windows Phone 8.1 new"

=> What does this mean...?

Should I call this option to update from WP 8.0 to 8.1 or not...?

I have seen various bugs in the WP-Emulator:

• the virtual keyboard cannot be closed with Enter (while in iOS and Android O.K.)

• the page-title is not showed (while in iOS and Android O.K.)

• the title of a Pick is not showed (while in iOS and Android O.K.)

• etc.

Maybe this problems have to do with "Windows Phone 8.0" ?

Thanks